Fix submenu and menu group focus

[yhy-1]

Fix focus for when the first menu is a group/sub-menu. The issue is with shouldFocusKey calculation, it should skip grouping since it is not focusable.
Related ticket: ant-design/ant-design#45367

[afc163]

Suggested change

	useImperativeHandle(ref, () => {
	return {
	list: containerRef.current,
	focus: options => {
	const shouldFocusKey =
	mergedActiveKey ??
	childList.find(
	node =>
	!node.props.disabled &&
	(node.props.children.length || node.props.children.type),
	)?.key;
	if (shouldFocusKey) {
	containerRef.current
	?.querySelector<HTMLElement>(
	`[data-menu-id='${getMenuId(uuid, shouldFocusKey as string)}']`,
	)
	?.focus?.(options);
	}
	},
	};
	});
	useImperativeHandle(ref, () => ({
	list: containerRef.current,
	focus: options => {
	const shouldFocusKey =
	mergedActiveKey ??
	childList.find(
	node =>
	!node.props.disabled &&
	(node.props.children.length || node.props.children.type),
	)?.key;
	if (shouldFocusKey) {
	containerRef.current
	?.querySelector<HTMLElement>(
	`[data-menu-id='${getMenuId(uuid, shouldFocusKey as string)}']`,
	)
	?.focus?.(options);
	}
	},
	}));

[codecov]

Codecov Report

Merging #669 (21cb290) into master (36f47b5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 21cb290 differs from pull request most recent head b59525a. Consider uploading reports for the commit b59525a to get more accurate results

@@           Coverage Diff           @@
##           master     #669   +/-   ##
=======================================
  Coverage   99.57%   99.58%           
=======================================
  Files          27       27           
  Lines         713      717    +4     
  Branches      192      196    +4     
=======================================
+ Hits          710      714    +4     
  Misses          3        3           

Files	Coverage Δ
src/Menu.tsx	98.69% <100.00%> (+0.03%)	⬆️

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[afc163]

Suggested change

	(node.props.children.length || node.props.children.type),
	(node.props.children.length || node.props.children.type === 'group'),

[Ke1sy]

@afc163 Thank you for suggestion, but after some testing we found out with @yhy-1 that current solution doesn't work properly as the focus moves to the group (which is not focusable), instead of the first focusable child of this group. Currenty I am working on improvements to fix it. Will push my changes soon.